Files in Python:
One of the most important subjects for programmers and automation testers is Python file handling (also known as File I/O). It is necessary to work with files in order to write to or read data from them.
Also, if you didn’t know, I/O operations are the most expensive processes where a programme can go wrong. As a result, you must use extreme caution while implementing file processing for reporting or any other reason. Optimizing a single file action can help in the creation of a high-performing application or a reliable automated software testing solution.
Consider the following scenario: you’re planning to construct a large Python project with a large number of workflows. Then it’s unavoidable that you don’t make a log file. You’ll also be handling the log file’s read and write activities. Debugging huge applications with log files is a terrific way to go. It’s usually better to consider a scalable design from the start, as you won’t be sorry later if you didn’t.
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File write() Method in Python:
The write() function is a built-in Python method that is used to write a specified text to a file.
In which the specified text will be inserted depending on the file mode and stream position.
“a”: The text is added at the current file stream point, which is usually at the end of the file(by default).
“w”: The file will be emptied before the text is inserted at the current file stream position, which is 0 by default.
Syntax:
fileobject.write(text/bytes)
Parameters
text/bytes: It is the text or byte object to be inserted.
Return Value:
This method’s return type is <class ‘int’>, and it returns the total number of lines written in the file.
File write() Method with Examples in Python
Example
Approach:
- Make a single variable to store the path of the file. This is a constant value. This value must be replaced with the file path from your own system in the example below.
- Open the file in append mode. In this case, we’re simply appending/adding the contents into the file.
- Write some random text into the file using the write() function.
- Close the given file using the close() function.
- Open the file in read mode. In this case, we’re simply reading the contents of the file.
- Read the contents of the file using the read() function and print it.
- The Exit of Program.
Below is the implementation:
# Make a single variable to store the path of the file. This is a constant value.
# This value must be replaced with the file path from your own system in the example below.
givenFilename = "samplefile.txt"
# Open the file in append mode. In this case, we're simply appending/adding the contents into the file.
gvn_file = open(givenFilename, 'w')
# Write some random text into the file using the write() function
gvn_file.write("hello this is btechgeeks")
# Close the given file using the close() function
gvn_file.close()
# Open the file in read mode. In this case, we're simply reading the contents of the file.
read_file = open(givenFilename, 'r')
# Read the contents of the file using the read() function and print it
print(read_file.read())
Output:
hello this is btechgeeks
File Content:
hello this is btechgeeks
Google Colab Images:
Files and Code:
